Lathe-turret-actuating mechanism.



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No. 790.312. y PATBNTEDMAY 2s, 1905.--

1J. G. POTTER & J. JOHNSTON.

LATHE TURRET AGTUATING MECHANISM.

. APPLIOATION FILED TAN. 7. 1901. ,f A

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y PATENTBD MAY 23, 1905. J. O. POTTER & J. JOHNSTON; LATHO TORRET AOTOATING MEOHANISM.

APPLICATION P'ILED JAN. 7. 1901.

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UNITED STAT-Es Patented May 23, 1905.

PATENT OFFICE.

JAMES O. POTTER AND JOHN JOHNSTON, PAWTUOKET, RHODE ISLAND, ASSIGN ORS TO POTTER AND JOHNSTON MACHINE COMPANY, OF PAW- TUOKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

LATHE-TURREVTFACTUATING MECHNISNI.`

SPECIFICATION formingpart of Letters Patent No. 790,312, dated May 23, 1905. l

Application led January '7, 1.901. Serial No. 42,367.

T LZZ whom t may concern: l

Be it known that we, JAMES C. POTTER, a citizen of the United States, and JOHN JOHN- STON, a subject of the Queen of Great Britain,

residing at Pawtucket, in the county of Provi` dence and State of Rhode Island, have inventedment in mechanism for automatically rotating 'i the turret oi" a lathe; and it consists in the peculiar and novel construction and the com? bination of parts whereby theturret is turned I 5 and locked at the desired part of its reciproeating movement and may be readily adjusted to any change in the length of travel, as will be more fully set forth hereinafter and more particularly pointed out' in the claims.

` 2O In a'turret-lathe the work is usually supported on and turned by the head-stock spindle and the tools are supported in the several sides of the turret, which is rotatably supported on the main tool-slide. recedes from the work and Vnears the end oi' the rearward travel the turret requires to be unlocked, partially turned, and relocked. As the length of the travel of the turret varies with the nature of the work, the point on the lathe at which the turret requires to be unlocked, partially rotated,and relocked changes with the change inthe length of the travel of the turret and the main tool-slide.

The main object of this invention is to construct the turret-operating mechanism and the mechanism for actuating the turret-operating mechanism so that in changing the length v of the travel of the turret the actuating mechanism may retain the position relative to the turret-operating mechanism.

Figure 1 is a plan view oi the main slide, showing the same provided with a turret toolholder and mechanism for operating and controlling the turret; Fig. 2 is a plan view, on

an enlarged scale, of part of the main slide with the turret tool-holder removed, showing the mechanism for operating the turret.' Fig. 3 is a longitudinal sectional view of part of As the turretl the main slidevand the turret tool-holder. Fig. 4 is a view of the base ofthe turret, showing 50 the operating and locking mechanism viewed from below. Fig. 5 is a longitudinal sectional lview of part of the main slide, the base of the-turret, and part of the turret, taken on a central line through the axisof the turret. Fig. 6 is a detail showing the lever connection with the base of the turret. Fig. 7 is a transverse sectional view of the slide secured to one side of the machine shown in Figs. l

and 2 for rotating the turret tool-holder. 60'

Fig. 8 is a detailview ofthe locking-bolt shown in Fig. 7

Similar marks of reference indicate corresponding parts in all the iigures.

In't'he drawings the main slide Z is sup'- 65 ported on the ways T T, formed'on the supporting-frame of the lathe in the usual manner. The groove T, of vT-shaped cross-section, is formed in the front of the lathe to receive the heads of bolts by which the slide sup- 7o porting the actuating mechanism for operating the turret may be secured.

On the slide (Z the bed Z3, forming the support of the turret di, is secured. On the bed Z3 an upwardly-projecting annular rim enters 7 5 an annular groove inthe under side of the.

turret. The locking-plate CZ, placed into a recess in the bed Z3, is secured to the turret by bolts and also by the pins Z6 Z 6. With the sockets Z 7 Z7 in the peripheral edge of the S0 locking-plate Z 5 engages the locking-bolt Z 8, which slides in a groove formed in the under side of the bed Z3 and is held in the locked position by the coiled spring Z9. With the pins ZG engagesthe pawl Z1, pivotally con- 85 nected with the slide Z11, actuated against spring-pressure by the rod Z 12. The lockingbolt Z s is withdrawn and the pawl is actuated after each'operation of a tool inthe turret by the backward vmovement of the main tool- 90 slide to unlock, turn, and relock the turret to present another tool to the work.

To operate the locking-bolt Z8 and the actuating-pawl cZw, the slide Z13 is adjustably secured to the front of the bed supporting the main tool-slide Z. From this slide extends the bracket OZ, which forms a stop against which the rod Z12 bears as the main tool-slide moves backward away from the work, thereby operating the pawl Z10 to turn the turret Z4 through a predetermined part of rotation,

Vas shown in the drawings, one-.sixth of a turn. The locking-bolt (Z8 has previously been withdrawn from the socket d1, with which it had been engaged by one arm of the bell-crank lever 0Z15. The bell-crank lever Z 15 is pivotally secured on a bracket d20, projecting from the bed da. One arm of the lever engages with the pin Z 17 on'the locking-bolt cZs, and the other arm, which is provided at its end -with a pin, engages with the arm Z 1,

pivoted at one end to the slide @Z13 and pro 'coiled spring Z9 nowrpushes the locking-bolt into one of the sockets Z7 to lock vthe turret and moves the bell-crank lever into the position shownin Fig. 2.

' To facilitate the accurate adjustment of the slide Z13 to the changes in the travel of the main tool-slide, the slide Z 13 is provided with the locking-pin Z19, having a collar on which a coiled spring bears and a feather which when the locking-pin Z19 is drawn out and partially turned rides on the outer V.surface and holds the locking pin in the unlocked position. The locking-pin enters a hole in the end of the bracket d20, on which the bell-crank lever CZ15 is pivoted. By loosening the T-bolts 21, by which the slide Z13 is secured, and engaging the locking-pin d1 with the bracket d20, as is shown in Fig. 7, the slide ZH1 will move with the main tool-slide Z and the turret-bed Z 3 to the end oi' the backward traverse and may be secured in the required position to operate and lock the turret.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. In a turret-lathe, the combination of a turret, a reciprocating support therefor, turretoperating mechanism, means for actuating said turret-operating mechanism, adjustable to different positions, and means for d'etachably connecting said actuating means with the reciprocating support for changing the position of the same, substantially as and for the purpose described.

2. The combination with a turret toolholder, a supporting-slide, a slidable pawl for rotating the turret, and a locking-bar, of a slide adapted to be secured to a ixed part of the lathe, an arm on the slide engaging with the pawl, means for operating the locking-bar, and a pin on thcslide adapted to be connected with the reciprocating turret-support to carry the Slide to the end of the reciprocation ofthe turret-support, as described.

3. In a turret-lathe, the combination of turret mechanism, a reciprocating.turret-snpport, means for actuating the turret mechanism adjustable- .to different positions, and 4means whereby said actuating means may be moved by the reciprocating support for changing the position of the same.

In testimony whereotl we have signedour names to this specification in the presence of two subscribing witnesses.

JAMES O. POTTER.

JOHN JOHNSTON.

Witnesses:

B. M. Sninus, J. A. MILLER, Jr. 

